921969285121 has 2 divisors, whose sum is σ = 921969285122. Its totient is φ = 921969285120.

The previous prime is 921969285113. The next prime is 921969285157. The reversal of 921969285121 is 121582969129.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722840040000 + 199129245121 = 850200^2 + 446239^2 .

It is a cyclic number.

It is not a de Polignac number, because 921969285121 - 2³ = 921969285113 is a prime.

It is not a weakly prime, because it can be changed into another prime (921969285101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460984642560 + 460984642561.

It is an arithmetic number, because the mean of its divisors is an integer number (460984642561).

Almost surely, 2^921969285121 is an apocalyptic number.

It is an amenable number.

921969285121 is a deficient number, since it is larger than the sum of its proper divisors (1).

921969285121 is an equidigital number, since it uses as much as digits as its factorization.

921969285121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 55.

The spelling of 921969285121 in words is "nine hundred twenty-one billion, nine hundred sixty-nine million, two hundred eighty-five thousand, one hundred twenty-one".